Banner viewing on PC and Mobile (size & appearance)

[siloxic]

Hey, apologies if it's a silly question. I am in the process of finalizing a purchase of a banner from Fiverr for my forum. I have received 4 sizes of the banner as I requested:

1000 (width) x 350 (height)
320x150
320x200
320x250

I need the same banner to be viewable on pretty much any and all devices (Mainly PCs and smartphones). How does it work with xenforo? Do I just put up the big banner (1000x350) and xenforo auto-resizes it for people logging in on mobile phones or do I need to...

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Banner viewing on PC and Mobile (size & appearance)

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